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  • Are you using a 4 TB SSD disk as a cache? That sounds a bit excessive. How big is the active data set? Are you running the cache off a disk similar to that used in the main pool? Depending on your setup, it might make sense to invest in one or two smaller (250-500 GB if that's your actively used set) NVMe drives for caching... Commented Jan 27 at 6:41